Abstract
Continuous wave laser operation in the 4S3/2→4I15/2 transition Of Er3+ has been achieved using an upconversion pumping scheme in YAIO3:Er3+ (1 %) at a temperature of ≤77 K. Two IR lasers were used for pumping with the excitation scheme shown in Fig. 1. The first laser at 792.1 nm is tuned to the strongest absorption transition between the 4I15/2 ground state and the 4I9/2 multiplet. Subsequent nonradiative relaxation populates the 4I11/2 and 4I13/2 metastable levels, which have lifetimes of ~ 1.2 and ~5.3 ms, respectively. The second laser is tuned to one of many possible absorptions from either of these long-lived states to levels above the upper laser level (4S3/2) at 18,406 cm−1.
© 1987 Optical Society of America
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